Novel fabrication of Porous Ni-5 wt.% Al alloy electrode below the melting point of Aluminum

Hyung Chul Ham, Sun Hee Choi, Seong Cheol Jang, Shin Ae Song, Sung Pil Yoon, Jonghee Han, SukWoo Nam

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

An in-situ sintered Ni-5 wt.% Al alloy anode for high-temperature fuel cells (HTFCs) was fabricated successfully using a green sheet consisting of a physical mixture of inexpensive Ni and Al elemental powders at reduced temperatures. Two processes-the formation of Ni-Al alloy via the AlCl3 activator under flowing hydrogen gas and the sintering of Ni-Al-occurred at the same time during pretreatment for cell operation. The AlCl3 activator reduced the synthesis reaction temperature and sintering temperature of Ni-Al alloy to nearly 600 °C. A twophase alloy of a Ni3Al intermetallic compound and a Ni-Al solid solution was obtained after sintering at 600 °C. The creep resistance of the in-situ sintered Ni-5 wt.% Al alloy was better than that of the conventional Ni-Al alloy green sheet, even though the sintering temperature of the Ni-5 wt.% Al alloy was 600 °C. This novel preparation method for Ni-Al alloys can greatly reduce the cost of anode fabrication for HTFCs and in turn accelerate the commercialization of HTFCs.

Original languageEnglish
Pages (from-to)2131-2136
Number of pages6
JournalScience of Advanced Materials
Volume9
Issue number12
DOIs
Publication statusPublished - 2017 Dec 1

Keywords

  • AlCl activator
  • Creep
  • High-temperature fuel cell
  • Mechanical strength
  • Nickel-Aluminum alloy

ASJC Scopus subject areas

  • Materials Science(all)

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